Calculating machine



Aug. 24, 1948. R. L.. MULLER CALCULATING MACHINE 9 Sheets-Sheet l Original Filed Feb. 6, 1939 Aug. 24, 1948. R. L. MULLER CALCULATING MACHINE 9 Sheets-Sheet 2 Original Filed Feb. 6. 1939 Y BY Roa'f L. [7L/ler 7;, IN1/wrok w, my M r Zwar A TTORNE Ys Aug. 24, 1948. R. L. MULLER CALCULATING MACHINE 9 Sheets-Sheet 3 Original Filed Feb. 6, 1939 /NVENToR Rober L. u//er Amilla/r? FA Tgys Aug. 24, 1948. R. l.. MULLER CALCULATING MACHNE 9 Sheets-Sheet 4 Original Filed Feb. 6, 1939 BY @M Aug. 24, 1948. R. 1 MULLER CALCULATING MACHINE 9 Sheets-Sheet 5 Original Filed Feb. 6. 19259 xxx II.

lx l/f iflxxxx Aug. 24, 1948. R. L. MULLER CALCULATING MACHINE 9 Sheets-Sheet 6 Qrginal Filed Feb. 6, 1939 /N VENTO/e Rolaerl cf//er A Tra/@NE V5 Aug. 24, R L. MULLER Re. 23,031

CALCULATING MACHINE Original Filed Feb. 6, 1959 9 Sheets-Sheet 7 INVENTOR BY Robert [WML/fer ATTORNEYS R. l.. MULLER Re. 23,031

CALCULATING MACHINE Aug. 24, 1948.

9 Sheets-Sheet B Original Filed Feb. 6, 1939 @r v 1 Il INVENTOR BYRobcrr Nd/@r aa/n gais ,JM rw ATTORNEYS Aug- 24, 1948- R. l.. MULLER Re. 23,031

CALCULATING MACHINE Original Filed Feb. 6, 1939 9 Sheets-Sheet 9 Fig. 14.

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5 A TT ORNE YS Reissuecl Aug. 24, 1948 OALCULATING MACHINE Robert L. Muller. Detroit, Michi, assigner to Burroughs Adding Machine Company, Detroit, Mich., a corporation of Michigan Original No. 2,288,916, dated July 7, 1942, Serial No. 254,790, February 6, 1939. Application for reissue June 30, 1943, Serial No. 492,946

l 80 Claims.

This invention relates chine, particularly to the ment thereof.

It is frequently necessary, in certain classes of bookkeeping and accounting work, to keep a running record of all the entries made in the machine for a given period of time, and, dui'- iug the making of such entries, to insert a number of individual ledger work sheets on which only a few entries are made. The record sheet is usually held in the machine during the entire run while the work sheets are inserted and removed from a front-feed throat that may be opened and closed. In order to speed up operations, it is desirable to have the iront-feed throat controlled automatically and to be operated by power` so that the operator has very little to do other than to insert and remove the work sheets and make the entries in the machine.

The present invention is directed to certain improvements in this type of paper handling equipment and it has the following objects in view:

The general object of the invention is to provide an improved paper handling equipment for calculating machines.

A more particular object is to provide an improved paper handling equipment of the frontfeed type in which the power of an electric motor is used to operate the mechanism independently of the cycling operation of the machine.

A further object is to provide an improved equipment of the class described in which the front-feed throat is automatically closed upon depression of the first amount key in the entry of an item with the throat open.

Other and more particular objects will appear from the following specication and drawings.

An embodiment of the invention is shown in the accompanying drawings in which:

Figure 1 is a left side elevation of a. machine with the invention applied thereto;

Fig. 2 is a partial plan view of a portion of the keyboard of the machine of Fig. 1;

Fig. 3-A is a perspective view of the upper half of the principal parts constituting the present invention; Y

Fig. B-B is a perspective of the lower half of the parte, said gure fitting below Fig. 3-A to make a complete perspective;

Fig. 4 is a detail side elevation of one of the cams used;

Fig. 5 is a detail perspective of the clutch;

Fig. 6 is a sectional side elevation showing to a calculating mapaper handling equipthe platen and the paper holding equipment; and

Fig. 7 is a detail view of a modiled form of construction.

Figs, 8-A and B B constitute perspective views similar to Figs. 3-A and B-B. showing certain modifications in the construction, particularly in the key control of the motor operated devices;

Fig. 9 is a perspective view of a portion of the paper carriage showing a modified form of line finder and paper table with the controls therefor;

Fig. 10 is a right end elevation of a portion of the carriage illustrated in Fig. 9, the platen being in throwback position and the combination front-feed table and line nder being in sheet receiving position;

Fig. 11 is a. diagrammatic view showing the position that the platen, paper table, and line iinder occupy when the platen is in throwback position with the front-feed throat op-en and when the combination paper table and line lnder are in line-finding and sheet-holding position;

Fig. 12 is a view similar to Fig. l1 showing the position that the parts occupy as the platen starts to move toward printing position;

Fig, 13 is another view similar to Fig. 11 showing the position that the parts occupy when the platen is in printing position;

Fig. 14 is a view similar to Fig. 11 illustrating the position of the parts as the platen starts to move from printing position;

Fig. 15 is another view similar to Fig. l1 showing the position of the parts after the platen has been moved to throwback position with the paper table and line finder in sheet-receiving position;

Fig. 16 is another diagrammatic view showing the position the parts occupy when the platen is moved to throwback position with the frontfeecl throat remaining closed, the paper table and line iinder being in sheet-holding and line-reading positions.

The invention is shown applied to a Burroughs- Moon-Hopkins type of machine whose general features are disclosed in Hopkins Patent No. 1,336,904. It is to be understood, of course, that the invention may also be applied to other types of machines.

This application is a. continuation-impart of my copending application, Serial No. 64,233, lecl February 17, 193B, renewed October 18, 1938, now matured into Patent No. 2,099,307, and it also includes certain subject matter previously disclosed in my copending application Serial No. 171,879, filed October 30, 1937, now matured into Patent No. 2.192.324.

General calculating machine features The machine, which is of the lO-key type, has a plurality of amount keys lll (Fig. l), which, when depressed, rock respective levers II counterclockwise to move thrust bars I2 upwardly to set pins I3 in a traveling pin carriage I4. During a cycle of operation of the machine, the pin carriage I4 is raised and the pins i3 that have been previously set. act to set pins I5 in a stationary eld of stops which serve to arrest actuator racks I6 in positions corresponding to the amount entered in the machine.

The forward ends of the actuator racks carry types I1 that are differentially positioned as the rack bars are positioned. After the type have been positioned. a. printing mechanism including the hammer IB, is operated to print the amount of the entry.

The machine ls provided with a. plurality of registers, of which two are shown. a front register 20, and a rear register 2|. These registers are brought into engagement with the actuator racks I8 at the appropriate times to perform addition, subtraction, and to take totals and subtotals.

Columnar-priniing control means is provided in order that printing may occur in different columns on the paper held about the platen P. In the embodiment shown, this comprises a traveling paper carriage 25 which moves across the machine from column to column under the control oi' a tabulating mechanism of which portions are shown at 25 (Fig. 1). The carriage normally tabulates from one column to another near the end of a cycle of machine operation in order that it may be in position for receiving the amount of the entry during the next cycle of machine operation.

The machine can be driven by hand. but is preferably operated by an electric motor 21 which is set into operation by either of two motor bars 28 and 28* (Fig. 2) so that. upon depression of the motor bar, the motor gives the machine a single cycle of operation during which calculating functions are perfumed depending upon how the machine has been conditioned.

Platen mounting The platen P normally occupies a. printing position relative to the types I1 of the printing mechanism. as shown in dot-dash lines (Fig. 6). However, it may be moved to a front-feed position as shown in full lines in said ligure.

For this purpose. the platen P is mounted between two end plates 30. of which one is shown in Figs. 3-A and 6. The rear sides of these plates support a cross shaft 3| (Fig. 3A) that, in turn. is fixed to a cross plate 32. The cross plate 32 is fixed to a second cross shaft 33 pivoted in the end plates 34 of the paper carriage. When the platen-frame end plates 30 are swung clockwise about shaft 33, to the position shown in Fig. 6, the platen is raised from its printing to its frontfeed position. The platen is urged to printing position by gravity and a. spring.

A record sheet 31 (Fig. 6) is held about the platen by means of flexible strips such as shown in Muller Reissue Patent No. 19.001, or by any other suitable means` so that the record sheet moves with the platen as it moves from printing to front-feed position, and vice versa.

pressure rolls 46 (Fig. 6) and the paper Front-feed throat The front-feed throat which receives the work or ledger sheets is formed by a set of paperengaging devices in the form of pressure or feed rolls 40 cooperating with the platen P (Fig. 6).

When the platen is in the front-feed position, shown in full lines in Fig. 6, the pressure rolls 40 are separated from it so that the front-feed throat between said platen and pressure rolls is open. A work sheet may then be fed over a table or chute 4I into the open throat where it is positioned by suitable collating means such as described in Muller Patent No. 2,055,552. The pressure rolls 4D are carried by a shaft 42 (Fig. 3-A) supported by levers 43. one of which is shown in Fig. 3-A. said levers being xed to a shaft 44 pivoted in the end plates 30 of the platen frame and being urged clockwise by a spring 45 as viewed in Fig. 3-A.

The front-feed throat is closed by causing the pressure rolls and platen to return into engagement with each other, the arrangement being such that the throat is closed to grip the inserted work sheet before th platen has returned toward printing position sufficiently far to disturb the collated position oi said sheet. As the platen is returned toward printing position, the inserted work sheet is wrapped about the platen by the chute 4| is moved to inclined position. as described in Mul- 1er Reissue Patent No. 19,001, and in said Patent No. 2,055,552.

Throat opening and platen throwback The platen is moved from printing to frontfeed position by means of an electric motor which is normally inactive and which may be set into operation by hand or automatically to throw the platen back to front-feed position at predetermined times.

The platen is automatically thrown back in accordance with the column in which printing occurs. Preferably. this is the column where a total is taken because, after a total has been taken and printed on a given work sheet, it is usually the practice to remove that work sheet and insert another for the next series of operation which also will be totaled.

In the embodiment of the invention shown, the traveling paper carriage 25 is provided with a cam 5U (Fig. 3A) positioned to engage a roller 5| on one end of a lever 52 plvoted at 53 to a stationary part of the machine. The other end of this lever is connected to a link 54 whose lower end is T-shaped and provided with two shoulders, or lateral extensions 55 and 56. The lateral extension 55 is positioned under one end of a curved abutment arm 51 slidable in a guide 5B and extending forwardly and downwardly to where it is pivoted to an arm 59 (Fig. 3-B) fixed to the shaft 60. The rear end of the abutment arm 51 is positioned adjacent a lateral lug 5| on a lever 62 which is a standard part of the machine that is rocked counterclockwise from the position of Fig. 3--A near the end of each cycle of machine operation and then returned clockwise to normal. The end of abutment arm 51 is normally below the lateral lug 6I, but when a cam 5U on the carriage rocks the lever 52 to pull the link 54 upwardly. the end of arm 51 is positioned in front of said lug BI so that, during the latter part of a cycle of machine operation,

` the arm 51 is moved forward to rock the arm 59 with its shaft 50 counterclockwise as viewed in Fig. 3--B. The rocking of shaft 6i! starts the motor and controls a clutch for the platen throwback mechanism as follows:

The right-hand end of shaft 80 (Fig. 3 3) has a plural-armed member fixed to it, which member is urged clockwise by a spring 1|. When the shaft 00 is rocked counterclockwise as Just explained, it is latched in its moved position by a latch 12 that engages over a lateral lug 13 on one of the arms of member 10. The rearwardly extending arm of the member 10 is connected to the upper end of a link 14 whose lower end is connected to one end of a pivoted lever 15 whose other end is positioned over a stud 16 on a link 11, which extends downwardly (Fig. 1) to a position where it controls a start and stop switch 18 (Fig. 1) for the motor 21. When the shaft 80 is rocked counterclockwise, through the parts set by the carriage and operated near the end of a cycle of machine operation, the member 10 ls rocked counterclockwlse, the link 14 is pulled upward, the lever 15 is rocked clockwise, and the link 11 is thrust downward to close the switch 18 to start the motor. This motor is also used to give the machine its cycles of operation. and the switch may be open or it may have remained closed when the above operation takes place. In any event, the switch is either closed or held closed, and the motor operates to throw the platen back without causing a cycle of machine operatlon. The motor continues to run until the platen is lowered to printing position, as will he presently described.

The motor drives a shaft 80 (Fig. 3-B) connected to which is secured a bevel gear |30*1 meshing with a bevel gear 8| journaled loosely on a shaft 82, the rotation of the bevel gear 0| being counterclockwlse as viewed in Fig, 3-B. Fixed to the bevel gear 8|, and loosely journaled on shaft 82, is a toothed clutch member 83 (Fig. 5). A second clutch member 84 is fixed to shaft 82 and this member carries a pin 85 (Fig. 5) urged by a spring toward the teeth on clutch member 83. This pin is normally held out of engagement with said teeth by means of stud 86 controlled by a cam nose 81 on a clutch controlling arm 89 fixed to the shaft 60. This cam nose engages the stud 86 as shown in Fig. 3-B to normally hold the clutch disengaged. 'Ihe clutch controlling arm 89 also has a cam nose 89, which is moved to active position when the nose 81 is moved out of active position.

The clutch is what is known as a "half-revolution clutch: that is. when it is released. it will move a half-revolution and stop. For example, when the shaft 80 is rocked counterclor'kwise as viewed in 3-B, the clutch cnntroll'ng arm 88 is rocked in the same direction which lifts cam nose 81 above stud 85 and outs the cam nose 89 in position for action. This releases the clutch nin 85 which then slides into engagement with clutch member 83. The clutch then rotates cointercloolfwlse until the stud 9E engages +he cam nose 89. whereupon the clutch pin B5 is moved out of engagement with the member 83. The clutch will thus be disengaged after the shaft 82 has been moved a half-revolution.

From the description thus far given. lt will be evident that, when the carriage reaches a column wherel its cam lill engages the roller El on the lever 52, mechanism will be conditioned, so that, during the latter part of the cycle of machine operation. the motor will be started and the half-revolution clutch engaged.

Fixed to rotate with the shaft 82 which is intermittently rotated by the clutch is a cam 90 (Fig. B--Bl whose edge cooperates with the stud 9| carried by a vertically movable slide 92. The upper end of this slide (Fig. 3-A) is connected by a stud and slot connection 93 with one arm of a bell crank yoke 94 plvoted at 95. The cross piece of this yoke carries rollers 96 and 91, one of which is rotatable about a horizontal axis and the other about a substantially vertical, but slightly inclined. axis. These two rollers are adapted to bear against the lower rear side of the cross plate 32 on the platen frame.

When the clutch gives the shaft 82 a halfrevolution from the position of Fig. 3-13, the high point of cam moves under the stud 9| and raises the slide 92. This rocks bell crank yoke 94 counterclockwise, as viewed in Fig. 3-A, and pushes forward on the lower edge of plate 32. If nothing were provided to prevent it, this would cause the platen frame to move forwardly to a diil'erent case-shift position, as will be described later, but, at this time, the frame is prevented from moving forward by mechanism as follows:

Fixed to a square stationary cross shaft |08 on the paper carriage is a bracket |0| upon which is pivoted a bell crank lever having a horizontal arm |02 and a downwardly extending arm |03, the bell crank being urged counterclockwise, as viewed in Fig. 3-A, by a spring |04. This bell crank has an L-shaped slot |05 in which a stud |06 operates, the stud being carried by an extension on the platen-frame end plate 30. The bell crank |02|03 is normally held in the position of Fig. 3-A by means of a lug on the rear end of a slide |01 that is urged to the left, or forward as viewed in Fig. 3-A, by a spring |98. This latter spring is stronger than the spring |04 so that it will hold the bell crank in the posi-- tion of Fig. 3-A against the tension of the latter, where, it will be observed, the stud |06 is ln the vertical portion of the L-shaped slot |05.

With the parts in this position, the platen frame cannot move forward and the pressure applied by the rollers 96 and 91 on the cross piece 32, which pressure is below the axis of shaft 33. causes the platen frame to rock about said axis to throw the platen from printing to the frontfeed position shown in Fig. 6. The platen is held in this position by reason of the fact that the high point of the cam 90 is. at the time, under the stud 9|, where it remains to hold the platen in throw-back or front-feed position.

Thus. when the carriage reaches a position Where the carriage cam 50 becomes active and the machine is given a cycle of operation, the halfrevolution clutch is thrown in, and the platen is automatically thrown to front-feed position and the front-feed throat opened by the power of the motor transmitted independently of the connections through which the motor cycles the machine. 'I'he manner in which the front-feed throat is opened will now be explained in more detail.

Automatically opening front-feed throat The front-feed throat is normally opened automatically at the time that the platen is moved to front-feed position, in order that the work sheet already in the machine may be removed and another one quickly inserted.

As explained, the pressure rolls 4t, forming a part of the front-feed throat, are carried by a shaft 42, which, in turn, is supported by arms e3 fixed to a rock shaft 44. The upper end of the arm 43 shown in Fig. 3-A has a curved extension provided with an abutment end I'I adapted to engage a stud III on arm II2 pivoted on the bracket IIlI. The stud III is controlled with reference to the path of the end IIB of arm 43. but, for the present description, the stud will be considered to be in the path of the arm.

As the platen is moved to front-feed position, the pressure rolls move with it and the arm 43, with its abutment end I Ill, moves clockwise about the axis of shaft 33 as a center. Shortly before the platen reaches its front-feed position, the abutment end III) of arm 43 engages the. stud III which blocks further movement of the pressure roll shaft, whereupon the platen moves away from the pressure rolls to open the front-feed throat.

Thus, considering the control of the frontfeed throat, when the carriage reaches a position where the carriage cam 50 becomes active, the electric motor is started, the half-revolution clutch is thrown in, and the front-feed throat is automatically opened by the power of the motor which acts directly for this purpose.

The front-feed throat is preferably opened after a totaltaking operation and the carriage cam 50 is preferably placed so as to become active in the total-taking column. Near the end of the total-taking cycle, the motor is started, as above explained, and the throat automatically opened. The total is usually taken with the carriage in its left-hand position, viewing the machine from the front. After the total-taking operation, the carriage is usually automatically returned to the right so that it will be in position for the next series of entries. During the return of the carriage to the right, the front-feed throat remains open so that the operator can remove one work sheet and insert another while the carriage is traveling across the machine. The cam 50 can. of course, be located in any desired position to vary the control of the throat opening.

During this time, the electric motor is running, because the shaft 60 is latched in position to keep the motor starting switch closed, but. since the clutch 83-84 is opened. the mechanism controlling the front-feed throat is not operated again, and the motor simply runs idly.

It is to be observed that the throat is not opened by an operation of the operating mechanism of the machine during a cycle of machine operation. On the contrary, near the end of a cycle of the machine, the lever 62 (Fig. 3-A) is operated, which causes the motor to start. throws in the clutch, and causes the motor to open the front-feed throat by a direct drive that operates independent of the cycling operation of the machine.

Automatic closing of front-feed throat After a new work sheet has been inserted in the front-feed throat, it is necessary that the same be closed before printing operations occur, and, in the present invention, this occurs automatically without requiring any attention on the part of the operator.

Referring to Fig. 1, the amount keys I0, when depressed, rock their levers II, which thrust the bars I2 upwardly as heretofore explained. Levers II also move an escapement bar (Fig. 3-B) upwardly to cause the pin carriage I4 (Fig. l) to move over a space after each key depression. The escapement bar is moved upwardly each time an amount key is depressed, and thus moves upward upon the depression of the rst amount key that is depressed for the entry of an item with the front-feed throat open. The bar |20 carries a stud I2I positioned under the laterally bent end i22 of one arm of a pivoted bell crank yoke |23 whose other arm |24 is connected to the latch 'I2 that holds the shaft 60 in the position to which it was moved to cause the motor to open the throat. The arrangement is such that, upon the depression of the rst amount key, no matter which key it may be, the latch 'l2 is released, whereupon the shaft 60 is rocked clockwise from the position of Fig. 3-B by the spring 1I. This will move the clutch controlling arm 88 clockwise which moves the cam nose 89 below the stud 85 which, at the time, is from the position of Fig. 3--B. The cam nose 81 is. at the same time, moved to active position. The clutch member 84 is thus released and it moves into engagement with clutch member 83. The clutch moves through a half revolution, that is, it moves until stud 86 carries around to a point where it engages cam nose B1 which disengages clutch member 84 from member 83. It will be recalled that the motor is running at the time because shaft Bil was latched in position when the throat was opened, and the switch is thus closed when the amount key is depressed. The rocking of shaft 6I] in a clockwise direction opens the motor switch but the momentum of the motor will rotate the clutch through a half revolution, this action resulting in certain advantages explained later. The rotation of the clutch, with shaft 82 and cam 9B, through a half revolution, brings the low part of the cam 9i! under the stud 9|, with the result that the slide 92 is lowered, the same being urged downward by the platen frame which, as previously explained, is urged toward its printing position. The downward movement of slide 92 enables the bell crank yoke 94 to move downward and permits the platen to lower toward printing position. As the platen moves toward printing position, it moves toward the pressure rolls 40 forming a part of the front-feed throat. The throat is closed to grip the papers and the pressure rolls then move with the platen as the latter moves to printing position. Thus the front-feed throat is rst closed and then the platen is moved to printing position, the arrangement being such that the papers are gripped before they are disturbed by the movement of the platen.

As mentioned, when the shaft 60 is rocked cockwise, the motor control switch is opened. At this time the motor is running and, while the opening of the switch cuts oi the energy supply to the motor, the motor and its connections have sufficient momentum to move the clutch and associated parts, the platen moving back to normal under the urge of gravity and a spring, not shown. The motor and its connections act as a governing means, as will now be explained.

Governing action of electric motor One of the important advantages of the invention is that the electric motor and its connections are such that they act as a governing means to regulate the speed and uniformity of movement of the parts in much the same manner as a dashpot is ordinarily used on a calculating machine. At the same time the motor and its connections, by their momentum, move suiilciently to cause the machine parts to be eased to iinal position.

Referring to Fig. 3-B, the cam 90 is so shaped that, as the motor moves it, the link 92 follows it and thus moves down gradually and in a uniform manner. The inertia of the connections and of the motor armature. as well as the friction of the parts, are such as to prevent the parts from moving too fast. 'Iheir speed is thus governed and their movement is made uniform. At the same time, the momentum of the armature and the connecting parts is such that the mechanism will be moved to nnal position. The result is that the platen is moved to printing position and the front-feed throat closed in a controlled and uniform manner, and without the noise and jar that usually occurs when a motor is employed to drive the parts to a. final position where they are suddenly stopped.

The action of the motor and its connections depends, in part, upon the point in the cycle of operation at which the motor switch is opened. In the construction so far described, when the shaft 60 is rocked clockwise, the motor switch is opened immediately. This has been found satisfactory when the motor is warm and the parts have been operated for some time. When the motor is cold and under conditions where the oil on the parts may be stiff, the parts may be retarded too quickly. or at least retarded too much so that the platen will not reach its flnal printing position. In order to insure that the parts will operate properly under all conditions, an added control has been provided which is adjustable so that the retarding action above described can be easily regulated.

Referring to Fig. 4, a disk |30 is fixed tothe clutch member 04. This disk has a small notch 3| in its periphery which is in the upper position shown in Fig. 4 when the platen is in printing position. The notch |3| receives a stud |32 on an arm |33 (Fig. 3-B) of a yoke |34 pivotecl freely on shaft B0. This yoke has ,another arm |35 extending rearwardly at the right side of the machine and a spring |36 serves to urge the yoke in a clockwise direction to cause the stud |32 to follow the periphery of the disk |30 at all times. The arm |35 engages a stud on a bell crank latch |31 pivoted to the machine frame and urged by a spring |38 in a clockwise direction to bring va notch |39 on its lower arm into engagement with a horizontal portion of member 11, the latter being a portion of the means for opening and closing the motor switch both for machine operations as well as for operations in moving the platen and opening the front-feed throat. When the member 11 is moved downwardly, the motor switch is closed to cause the motor to operate, whereas upward movement or member 11 opens the switch to stop the motor.

When the clutch member 04 is in normal position, then platen is in printing position, and the front-feed throat closed, the stud |32 occupies the notch |3| in disk |30 as shown in Fig. 4. This allows yoke |34 to be retained in its clockwise position with the shoulder |39 of latch |31 out ci engagement with member 11. The latch is thus normally held inactive so that it will not retain the motor in running condition after the machine has been operated.

When the front-feed throat is Opened and the platen is moved to front-feed position, the clutch member M rotates one-half revolution and the disk Hill travels a like distance. This .cams the stud |32 out of notch I3! and rocks yoke 13A to release the latch |31. It also brings a large notch to the rear of `stud |32 as indicated in dot-and-dash lines in Fig. 4. In this posi-MDD. Of

disk |30, the stud |32 will rest on the outside periphery of the disk and the latch |31 will be free to engage the memoer 11 controlling the motor switch. It will be recalled that. while the front-feed throat is being opened and the platen raised, and while the parts are retained in this position, the motor is kept running because the latch i2 (Fig. 3--Bl is engaged with the lug 13. thereby retaining the four-arm member 10 in its counterclockwise position, the latter serving to hold member 11 downward against the stud 1B. However, upon depression of the rst digit key. the latch 'l2 is released, which allows the fourarm lever 10 to restore clockwise, thereby rocking shaft 60 and conditioning the parts to cause the iront-feed throat to be closed and the platen lowered to printing position. AS described earlier in the specication the motor switch is opened when the shaft 60 is moved, But, with the mechanism just described, at the instant that the fourarm member 'l0 is released, instead of the motor switch being opened, the lat-ch |31 acts to retain the switch member 11 in lowered position, thereby causing the motor to continue to run. Then, as the clutch member 84 starts its one-half revolution of return movement to close the irontfeed throat and lower the platen, the large notch |40 of disk |30 moves under the stud |32 and the stud drops into the notch, whereupon the yoke |35 is rocked clockwise (Figure 3--Bi to release latch |3'| and member 11, thereby allowing the motor switch .to open. The momentum oi the motor is then relied upon to move the parts to final position, and the inertia of the parts is used to govern or regulate the movement.

Since these machines often have carriages of different widths and since the individual pants on some of the machines may vary slightly from th-ose on others, a control of the motor release is provided in order that action of the motor can be easily adjusted. This adjustment is obtained by means of a plate |42 (Fig. 4) whose position on disk |30 can be changed by the use of an adjusting screw |43. This plate has 4an outer edge that corresponds to the periphery of the ldlslr [30. By locating this plate to the desired position, the time at which the stud |32 is allowed to drop into the large notch |40 can be closely regulated to obtain the desired timing of the opening ofthe motor switch.

While this use vof the motor for governing the movement of parts during their return has been shown for governing the control of the vclosing of a front-feed throat and the movement of a platen to printing position, it can also be einployed for governing other parts of a calculating or similar machine and ca n thusact like a Vdashpot, or air cushion, or retarding device for insuring a uniform action of the mechanism, for governing the speed of movement lol. the mechanism, and for cushioning the movement of the parts to final position.

Automatic line spacing It is desirable to line-space the record sheet between each series of entries on the dierent work sheets. and provision is made in the present machine for automatically accomplishing this. Usually each series of entries is made onthe como line after which a total is printed on. this Same line and then the record sheet is line spaced. `In other words, the line spacing should occur .after each totaling operation.

The link 54 that is raised by the lever `52 con milled by the paper carriage has a lateral lug |56 (Fig. 3-A) which is positioned under one arm of a bell crank lever pivoted at |52. The other arm of this bell crank lever is positioned in front of a stud |53 on ,a lever |54 pivoted on a stud |55 on a slide |56.

The upper end of the lever |54 forms an abutment which, when the bell crank |5| is rocked counterclockwise by the raising of link 54, is moved under a stud |51 that during a cycle of machine operation, is moved downwardly from the full to the dot-dash position of Fig. 3-A and then returned upwardly, said stud being a standard part of ithe machine. The slide |56 is connected at its upper end to one end of an arm |66 pivoted at |6|. Intermediate its ends the arm |66 is provided with a lateral lug |62 and a roller stud |63 which straddles a bail |64 carried by arms |55 pivoted on studs |66 on the main carriage frame. The free end of the right-hand :arm |65 (Fig. 3-A) carries a line space pawl |61, that operates on a ratchet wheel |66 on the platen P.

With this arrangement, when the carriage reaches a column where the cam 56 becomes active, the link 54 is raised, the bell crank |5| is rocked, and the lever |54 is moved so that its abutment end is under the stud |51. Then, during the latter part of the cycle of machine operation, the slide |56 is moved downwardly which pulls the bail |64 downward and moves the line space pawl |61 upwardly. During the return stroke the parts are returned to normal, the line space pawl being moved downwardly by a spring |66 to cause a line space movement of the platen.

It is to be observed that this automatic line space operation takes place as an incident to a cycle of machine operation and is not dependent upon the motor driven clutch heretofore described for operating the front-feed means. The latter does not operate until after the line spacing operation has occurred.

Front-feed throat control In the prior description of the opening of the front-feed throat it was assumed that the stud (Fig. 3--Al was in the path of the end ||6 of the arm 43 connected to the shaft 42 carrying the rollers 46 that form a part of the front-feed throat. Said stud is not normally in said position but it is automatically moved to such position by mechanism associated with the line spacing controls just described.

The link 54, which is moved upwardly by the lever 52 under the control of the paper carriage, has, as previously mentioned, a lateral lug 56. This is positioned under the edge of an abutment arm |16 pivoted to a second arm |1|, which, in turn, is pivoted on a stud |12. The rear end of the abutment arm |16 is adapted to be engaged by the lateral lug 6| on the lever 62 which, it will be recalled, is rocked counterclockwlse as viewed in Fig. B-A at the end of a cycle of machine operation. The arm |1| carries a stud |13 positioned behind an arm |14 pivoted on one arm of a yoke |15 (Fig. 3 3) journaled loosely on the shaft 66. The arm |14 has a notch |16 (Fig. 3--A) in it adapted to engage over the stud |55 on the slide |56. The yoke |15 has another arm carrying a stud |11 (Fig. S-B) positioned in the path of a cam |18 on the shaft 82.

When the link 54 is raised under the control of the paper carriage, as heretofore described, the abutment arm |16 is moved so that its end is in front of the lateral lug 6| on lever 62. Near the end of the cycle of machine operation, and

after the line spacing operation just described. during which slide |56 is moved downward and then returned upwardly, the arm |16 is pushed forward, which moves the notched arm |14 forward so that its notch moves over the stud |55. The arm |16 is latched in its forward position by the engagement of a notch |16 in the arm with the lug 56 on member 54. At the time the abutment arm |10 is moved forward, the abutment arm 51 is also moved forward and it will be recalled that the latter starts the motor and throws in the clutch for raising the platen. The clutch rotates the shaft B2 counterclockwise a half revolution (Fig. B-B) and the latter, in turn, rotates the cam |16 a half revolution. The cam engages the stud |11 and rocks the yoke |15 clockwise which pulls arm |14, and the slide |56 to which the arm is connected, downwardly. The slide |56 rocks arm |66 and pulls the bail |64 downward. If the platen had remained in printing position, another line space operation would have taken place, but, in the meantime, the platen has been moved out of printing position so that the line space mechanism becomes ineffective, the ratchet |48 having moved away from pawl |61.

The left-hand arm |65 carrying the bail |64, which is pivoted at |66, carries a stud |86 positioned under the ||2 arm carrying the stud When the bail |64 is pulled downward as just explained, the stud |86 swings arm |`|2 upward and the stud I|| is then raised so that it is in the path of the abutment end ||6 of the arm 43. The result is that, as the platen moves towards printing position, the end of the arm 43 engages the stud and further movement of the pressure rolls forming a portion of the front-feed throat is prevented. The platen then moves away from the pressure rolls and the front-feed throat is opened as heretofore explained.

Moving the platen to front-feed position without opening front-feed throat In the machine disclosed, it is necessary to v' raise the platen in order for the operator to inspect an entry that has been made. It is desirable, at times, to move the platen back to read an entry without opening the front-feed throat. Provision is made for doing this automatically, or under the control of a key.

For automatic control, the paper carriage is provided with a cam |96 which is slightly smaller than the cam 56, with the result that when the carriage reaches a column where the cam |66 is active, the lever 52 will be rocked, but it will not be rocked as far as when acted upon by the cam 56. The parts are proportioned so that this will raise the link 54 a distance sufficient to raise the rear end of the abutment arm 51 in front of the lug 6I but not sufiicient to raise the rear end of abutment arm |16 in front of said lug. The result is that, when the lug 6| is moved forwardly near the end of a cycle of machine operation, the arm 51 is moved forward to start the motor, throw in the clutch, and cause the platen to be moved from printing to front-feed position. But, because the abutment arm |10 is not moved forward, the notched arm |14 is not hooked over the stud |55 and the slide |56 will not be pulled downwardly. Thus the bail |64 will not be moved and the stud which blocks movement of the end ||6 of the lever 43 connected to the shaft 42 carrying the pressure rolls 46 of the front-feed throat, will not be positioned in the path of said end ||6. The result 13 is that the front-feed throat will not be opened as the platen is moved to front-feed position.

Thus, the platen can be automatically thrown back to front-feed position in a predetermined column, while the front-feed throat remains closed, which enables the Operator to read the entry without having the papers released. This position will be called the reading position ol the platen and front-feed means. In the embodiment of the invention illustrated, this position of the platen is the same as the frontfeed position to which the platen is moved when the throat is opened. In one case the throat is closed and in the other it is open, but the platen is in its front-feed" position in both cases. The terms "out of printing position, and throwback position, are broad terms including both the so-called front-feed and reading positions.

If the operator desires to look at an entry in some column where the paper carriage does not throw the platen back automatically he may do so by manipulating a key control which operates as follows:

Referring to Fig. 3-B, a key 20!) is connected by a link 20|, to an ann 202 of a three-armed lever pivoted at 203. The upper arm 204 of this lever is connected by a link 205 to an extension of the member 1D xed to shaft 60. Thus, when the key 20G is depressed, the three-armed lever is rocked counterclcckwise which rocks member 1B and shaft 60 counterclockwise. This starts the motor and throws in the clutch to cause the platen to be thrown back. At this time, the carriage has not lifted link 54 and abutment arm so that the notched arm |14 is not hooked into stud |55. Accordingly, when the platen is thrown back, the front-feed throat will not be opened. When the shaft 60 is moved as above described, it is latched in the position to which it is moved by means of the latch 12 heretofore explained.

A novel and convenient feature of the present construction is that the operator may return the platen to printing position by a second depression of the same key 200. The member 10 has a V- shaped nose 2|!! with which a roller stud 2!! on a pivoted bell crank lever 2I2 cooperates. 'Ihis bell crank lever is carried by the rearwardly extending arm 2|3 of the three-armed member 2|!2'204-2|3, and it is urged to the position of Fig. 3-B by the spring 2|4. The first time the key u is depressed the roller stud 2| rides on the rear edge of the V-shaped nose 2!!! and the movement is an idle one. At the time the second depression of the key Zilli occurs, the nose 2li) has been moved rearwardly, by reason of the member 10 having been rocked counterclockwise. When the key 200 is depressed a second time, the three-armed lever 22-24-2I3 is rocked counterclockwise, at which time the stud 2!! moves over the forward edge of the nose 2H). This moves the stud in a path such that it engages the lower edge of an arm 2|5 connected to the latch 12, the stud being long enough for this purpose. This releases the latch 12 and, when the latch is released, the member 1!) is returned clockwise by its spring 1! which rocks the shaft 6|) to cause the clutch 83-84 to go through another half revolution to lower the platen from front-feed to printing position.

In this manner the operator can very quickly have the platen thrown back to reading position by power and as quickly returned, the control being by the same key.

Automatically holding free ends of work sheets when platen raised to read entries When the platen is moved out of printing position to enable the operator to read an entry, the free ends of the work sheet, or sheets, unless otherwise prevented, tend to fall forward. Automatic means has been provided for holding the free end of the work sheet in position when the platen is thrown back for the purpose of enabling the operator to read entries, said holding means being automatically disabled when the platen is moved back and the front-feed throat opened,

Referring to Fig. 3A, there is pivote-d on a shaft 220, carried by the movable platen frame, a linger 22| normally occupying the position of Fig. 3-A where it is at the side of the work sheet. This finger has a tail piece 222 with which cooperates a cam arm 223 xed to a shaft 224. There is a second i'lnger at the left-hand side of the machine, as viewed from the front. and a second cam arm on the shaft 224. said second set of parts operating at the same time as the first except that the left-hand linger is swung counterclockwise while the first finger 22! is swung clockwise. Fixed to the shaft 224 is a. crank arm 225 carrying a stud 226 cooperating with a cam surface 221 on a lever 22B pivoted at 229 on the main carriage frame. The lower end of this lever is connected by a link 230 to a bell crank 23| pivoted at 232 on the main carriage frame and having an abutment surface cooperating with the stud 233 on the arm which is moved when the bail |84 is moved.

Assuming that the parts are in the position ol' Fig. 3-A, if the platen is thrown back the shafts 22D and 224 swing back with it and the stud 228, riding on the cam surface 221, rocks the shaft 224 counterclockwise, which swings the fingers 22! to substantially horizontal position in front of the work sheet. Thus. as the platen is moved upwardly, the free end of the work sheet is held by the fingers to prevent it from falling forward. A latching means is provided for retaining fingers 22| in position until the platen is returned to printing position, said latching means and its release being disclosed in detail in Reissue Patent No. 19,001. The cam surface 221 of the lever 228 is active under the conditions above explained because this cam surface is held rigidly in position by the link 23D and the bell crank 23! which abuts against the stud 233. The stud 233 remains in the position shown in Fig. 3-A during the raising of the platen for reading purposes because, during such action, the bail |54 is not rocked. it being recalled that this bail is rocked only when the link 54 is raised to its higher position, which does not occur when the machine is conditioned to throw the platen back to read an entry Without opening the front-feed throat.

When the platen is moved back to front-feed position and the front-feed throat opened, the above fingers 22| do not operate because, at that time, the bail |64 is pulled downwardly which raises the stud 233 away from the abutment end of the bell crank 23|. The result is that the cam 221 is not held rigidly in position and will not act to swing the crank 225 and shaft 224 as heretofore explained. Thus the linger moving means is automatically disabled at the time the frontfeed throat is opened.

Control by totaltacng control means A modification of the invention is shown in Fig. '7 in which the throwback of the platen and the opening of the front-feed throat are controlled so that the throat opens only after a totaltaking operation.

Referring to Fig. 7, the connection between the lever 52 and link 54 is made in the form of a stud and slot connection which allows a limited relative movement between the parts, the parts being connected by a spring 250. When the paper carriage arrives at the total-taking column it rocks the lever 52, but the link 54 is prevented from moving by means of a latch 25|. Thus, while the paper carriage tends to condition the parts, it does not actually condition them but tensions the spring 250.

The machine is provided with total-taking control means of Well-known construction which, when the total key 240 (Ba1 Fig. 2) is depressed, operates to condition the machine to enable a total to be taken by a single cycle of machine operation. When the total key 240 is depressed, it rocks the latch 25| by means of a releasing lever 252. The latter is connected by a link 253 (Fig. 1) to a bell crank 254, which, in turn, is connected by a rod 255 to the Bal or total key. Depression of the total key thus releases link 54 which moves upwardly and conditions the parts as heretofore described so that, during the latter part cf the cycle of machine operation, the motor switch is closed and the front-feed throat automatically opened. The platen is, of course, also moved to front-feed position.

Accordingly, in the total-taking column of the machine, the front-feed throat will be automatically opened after a total is taken. While the carriage ordinarily moves to another position after a total is taken, it can be retained in the total-taking column by depressing the nontab" motor bar 28 (Fig. 2). In that event, with the carriage stationary, items may be entered in the machine and the machine cycled but the throat will not be automatically opened until a total is taken.

When the total is negative, the machine must be put through three cycles, and this may be done under the control of certain keys that are manipulated by hand, as described in Hopkins No. 1,206,113, and Mueller No. 1,715,170I or the entire three cycles may be caused to take place automatically upon depression of a credit balance key 24| (Cr. Bal.) (Fig. 2). When the negative total operations are controlled manually, the "extend key 242 shown in Fig. 2 is depressed and the machine given a cycle of operation. The subtract" key 243 is depressed and the machine given another cycle of operation. Finally, the total key 240 is depressed and the machine given a third cycle. When the three cycles are controlled automatically, only the credit balance key 24| is depressed. The latter controls mechanism, not shown, which causes the three cycles of machine operation to take place automatically and the machine to be automatically conditioned for each cycle. The true negative total is printed during the third or last of these three automatic cycles. In the taking of a negative total, it is not desired to have the front-feed throat opened during the first two cycles but it should open after the total is printed during the third cycle. The present invention takes care of this condition by reason of the fact that the total key is depressed only for the actual total-printing cycle and the carriage-opening or platen throw-back means cannot operate prior to printing during the cycle following upon the depression of the total key.

Since the total key controls the function of total taking, it will be referred to as a function control key in some of the claims.

Power operated case shift mechanism The platen is moved from one case shift position to the other by moving it horizontally. The normal position of the platen is that shown in Fig. 3-A. In order to move it to the capital letter case shift position the platen is moved forwardly.

For the purpose of moving the platen, a case shift key 28u (Fig. 3-B) is provided which is connected through a link 28| to an arm 282 loosely mounted on the shaft G0. This arm is positioned over stud 283 on an arm 284 ilxed to the shaft so that. when the arm 282 is rocked by depression of the case shift key, the shaft 60 is rocked counterclockwise to start the motor and throw in the clutch heretofore described. The arm 282 also has a lug 285 extending over the edge of an arm of a yoke 286 pivoted loosely on the shaft 60. This yoke has a downwardly extending projection 281 provided with a bifurcated end in which is positioned an arm 288 of a bell crank lever pivoted at 289 and urged counterclockwise as viewed in Fig. 3-B by a spring 290. The other arm of the bell crank lever has a stud 29| operating in a groove in a sleeve 292 slidable on shaft 82 and attached to cam 90. The latter has an opening in it through which projects a pin 293 on a cam 294 fixed to shaft 82. Cam receives its rotative movement through pin 293 which is moved by cam 294 fixed to shaft 82. The cam 294 is adapted to operate against the stud 9| but, as long as cam 90 is active, cam 294 has no effect because it is smaller than 90.

When the case shift key 280 is depressed, the arm 282 rocks the yoke 286 counterclockwise, which rocks the bell crank 288 clockwise and shifts the cam 90 laterally to the right a distance sufficient to move it out of the path of the stud 9|. The result is that, when the clutch 83-84 gives the shaft 82 and sleeve 292 a half revolution. the cam 294 acts on the stud 9| to raise the slide 92, but the slide is not raised as high as when the cam 90 acts.

When the slide 92 is raised the shorter distance, the bell crank yoke 94 is rocked to push forward on the plate 32 as heretofore explained. If the platen frame were blocked against sliding movement, as previously described, the platen would be tilted back toward front-feed position, but the depression of the case shift key unlatches the platen frame as follows:

The yoke 288 (Fig. 3-B) has an upwardly extending arm 300 pivoted to the end of a lever 30| whose upper end is connected by a link 302 to a pivoted arm 303. This arm carries a stud 304 engaging a bail 305 pivoted at 308 and extending across the paper carriage. This bail is connected at its left-hand end to the slide |01.

When the case shift key is depressed, the yoke 286 is rocked counterclockwise, which rocks lever 30| clockwise and pulls the bail 305 to the rear. This moves the slide |01 rearwardly and the lug on its rear end releases the bell crank latch |02|03 which is thereupon rocked counterclockwise by its spring |04. This moves the horizontal portion of the L-shaped slot |05 into line with the stud |06 on the platen frame, so that, when pressure is applied to the plate 32 by the bell crank yoke 94, the platen frame is slid forwardly instead of being rocked and the sosi . 17 platen is moved to a'. new stead of being thrown tion.

Whenthe case'v shift key is released, it moves upward to normal position which allows the shaft 6U to restore to normal and causes the clutch to give the shaft 82 and sleeve 292 another half revolution. Thishrotates' cam 294 a half revolution and restores the slide 92 to normal. Also, the cam 30 is restored laterally to the position ofFig. 34B and the slide l U1 is allowed to return to normal, its spring [08 overcoming spring Ill4. The platen returns to its normal case shift position under the urge of a spring. y When the case shift key is depressed, the latch T2 at the right-hand end of shaft 60 does not latchrthe shaft in position because the case shift key does not move the shaft 60 counterclockwise as far .as it is moved by the other mechanisms heretofore described, and not far enough to enable' the latch to act.

case shift position inback to iront-feed posi- Modified automatic control Figures 8-'A and 8-'B illustrate a modified form of automatic control which is constructed and arranged asf follows:

The carriage controlled lever 52 (Fig. 8`A) has7 a' stud` 310" on its end instead of the cam roller illustrated in Fig. LA. Mounted on the carriage is acontrol shaft 3H on which the cams or tappets for operating the lever 52 are mounted'. The one to the right in'Fig. S-A comprises a body 3|2 a'diiustably mounted on shaft 3H and supporting a pass-by pawl 3|3 adapted to engage the stud 313 in predetermined positions of the paper carriage. The pass-by pawl 3I3 acts on' af'stud 3W when the' carriage is moving in tabulating direction but passes over this stud during return of the carriage.

They lever 52 may be also rocked during the return of the carriage and for this purpose a; caxrr support 314 is adjfustably mounted on the shaft 3H, said support carrying a pass-by pawl 3I5 adapted to act onthe studl 3l0 during the return of the carnage but passingover said stud when the carnage is movingr in tabulating direcidon.t

The canr supports 3|-2 and 3M may be adjusted onl the shaft' 3H so thattheir pawls Will act on the stud 3H) in almostany desired position relative to the stationary position toward which the paper carriage may be moving. For example, the pawl 3| 3 may act on saidstud while the carriage is' roving between columnsin tabulating direction o'r it may be" positioned so as to'actjust before the`cl"ria`g'ifeches a stationary position in thecolum'n" t'Q` which the carriage is moving in vniicir eve-finte operaties. of die mechanism for oe'ihg' the f'r'oniLfed throat willltake place with" th'cfariiage in stationary position in said column because thejcarriagereache's said positiiibfbrtlie mechanism has an opportunity to operate. l t 1 Although it is otl'ielwisey yin (Fig. 8-A, thesupport 3l^4 for the pass-by pawl 3l5 is preferablyi located'tocausethe paw] to operate just asth carriage startsto returnV so that the frontfeed throat wi-libe open during the major portionj of the return movement of the carriage theeby' enabling' the'operator to remove a sheet while-the carriage is returning to its right-hand position.

The carriage control lever 52 is connected to a link 54 as in`A the filstdescribed construction. This-linkisurgeddownwardly'by spring 3l li-r con'- be opened at the time the platen is ment.

18 nected to a lateral lug 3l1 on the lower end of the link. The lug 3 I1 is positioned under a shoulder on a. paw] 3I8 pivoted on a member 3l9, the pawl 3|8 being urged clockwise as viewed in Fig.

Y 8-A by spring 320 against a limit stud which prevents paw] 3l8 from interfering with the movements of link 54. The member ST9 is urged forwardly by a spring 32! but is normally prevented from moving forward by a lug 322 on said member which engages behind the edge of a stationary plate 323. The front end lof al member 3I9 connected to the upper arm of a bell cr'anl: 321!` pivoted on the shaft 60 that controls the motor switch and the clutch heretofore ex-v plained. The rear end of member 3|!! is urged downward into contact with the plate 323 by a spring 325.

From the above it will be clear that when the lover 52 is rocked clockwise by one of the car-v riage cam-pawls 3I3 or SI5 the link 54 will be raisedA which will raise the rear end of the member 3|'9 so asrto free it to be moved forward by the spring 32|. When the member 32| moves forward, it rocks the arm 324 countercloclcwisfel and said arm engages a lug on an arm 324EL that is fixed to the shaft 60. This rocks the shaft Ell in a direction to start the motor and engage the clutch for moving said shaft 82 (Fig. 8-B) coun-` terclockwise through a half revolution. It is to be noted that the carriage may thus start the motor to operate shaft 82 without any regardvv to the cycling of the machine. For example, the paper carriage may be moved by handA to a, posi-i tion to cause one of the cam-pawls 3"!3 or v315 to act, in which event the motor will be started" and the clutch engaged to operate the parts driven by the shaft 82. When the parts are conditioned by movement of the carriage in tabulat-` ing or return direction, the motor is' started and' the shaft 82 is moved through a halfrrevolutiorr without causing a cycle of machine operation ali though'A the control of the parts is initiated by the paper carriage that is moved as an' incident to the machine cycle. K

When` the shaft 8i is givena half revolution! the link 92 (Fig. 8 A) is moved upwardly which rocks yoke 94 to move the platen to throwback position as hereinbefore explained.

When it is desired that the front-feed throat thrown back, it is necessary that the stud Il I (Fig. S-A) be moved into the path of the abutment end IIll` of thelever 43 as heretofore explained, said stud' lll normally being out of the path of said4 abut- Forthis purpose a lever 326 is provided which is pivoted at 321 to a stationary part of the machine. said lever being urged counter-l Clockwise in Fig. s-A by a spring 32s; the upper end ofthe lever having a lug limiting against a stationary partici the machine. Pivoted to the, lower end of thisl lever' vat 329 is a second lever 330 having on its rear end a lateral lug 33)! adapted to be engaged by a shoulder on the member 3`I9. The lever 330 is urged upward by a spring 332f which tends to keep the lug 33| in" front of the shoulder on member 3I9. The lower end of the lever 326 has a lateral lug' 326 on it which is positioned in front of a pawl 333 which corresponds to the pawl |14 in Fig. 3-A.

When the member 3|9 is moved forward its shoulder engages the lateral lugr 33| and moves the lever 330 forwardly which swings the lower end of lever 326 forward to move the lug 32B" away from the paw] 333, whereupon said pawl is rocked counterclo-ckwise by a spring 334 to cause its notch 335 to engage over the reduced end of a stud 336 on the member |56, said stud correspending to stud |55 in Fig. 3-A. The pawl 333 is pivoted at 331 on one arm 338 of a yoke device 339 journaled loosely on the shaft 66. The other arm 346 of this yoke extends rearwardly where it carries a stud 34| (Fig. 8-B) adapted to be engaged by the cam |16 on the shaft 82. As said shaft 82 is rocked counterclockwise through a half revolution, said cam |18 engages stud 34| and rocks the yoke 346-339-338 clockwise, thereby pulling down on the pawl 333 and moving the slide |56 downward. This rocks the lever |66 and pulls the line space bail |64 down- Ward.

Accordingly, when the member 3|9 is moved forward to start the motor and engage the clutch for driving the shaft 82 through a half revolution, pawl 3'33 moves forward and connects itself to slide |56 to cause the rocking of shaft 82 to pull down the line spacing bail |64.

. The left-hand arm |65 that supports the line spacing bail is pivoted at |66 and its forward end supports a stud |86 which, as heretofore eX- plalned, is positioned under the arm ||2 carrying the stud I I. When the line spacing bail is pulled downwardly the stud |36 rocks the arm ||2 counterelockwise to move the s-tud into the path of the abutment end ||6 of lever 43. Accordingly, the parts will be conditioned so that, as the platen is thrown back, the front-feed throatwill be opened.

The member 3|3 and associated parts are restored to normal by means of a stud 342 (Fig. 8--A) on the arm 340 of the yoke 339. Said stud is adapted to engage a rearward arm 343 of the bell crank 324. Near the end of the downward movement of yoke 338-333--34CL lthe stud 342 rocks bell crank 324 clockwise and said bell :c1-ank, in turn, moves the member 3|9 rearwardly to where the shoulder 322 will re-engage the rear edge of the plate 323 even if the link 54 should still be held in its elevated position by a lcarriage cam. When the member 3|! moved forward, it c-arried the pawl 3|8 out of engagement with the lug 3|1 lto permit the rear end of the member 3|!! to drop as soon as its shoulder 322 is again moved rearward of the rear edge of the plate 323, regardless of the posi-tion of the link 54.

It will be recalled that the platen frame has a forward sliding movement as well as a rocking movement, the sliding movement being for the purpose of enabling the platen to be moved to its upper case position. In order to obtain a rocking of the platen frame said frame must be blocked :against sliding movement and mechanism for obtaining this result has been heretofore explained. In the modification of the invention now being described, this mechanism has been changed slightly. The platen frame is normally free to move forward for case shift operation, but when the platen is thrown back said fram-e is automatically locked against ease shift movement. Referring to Fig. S-A, it will be observed that the line space bail |64 has been extended to the left and connected to one end of the lever 356 pivoted at 35| on the carriage frame. The other end of this lever carries a stud 352 positioned over the edge of a lever 353 pivoted on the stub shaft 354, said lever` being urged counterclockwise by a spring 355. The forward end of this lever has a shoulder 356 adapted to engage over a stud 351 fixed Ito the left-hand side plate 36 of the platen frame. In

the normal position of the parts shown in Fig. 8--A, the shoulder 356 on the end of the lever 353 is above stud 351 and the platen frame is free for the case shifting. But when the line space bail |64 is pulled down at the time the platen is thrown back, lever 356 is rock-ed clockwise, which raises stud 352 and frees lever 353 to permit it to be rocked by its spring 355 to move shoulder 356 over stud 351. This locks the platen frame against forward movement.

When it is desired that the platen be moved to throwback position for reading purposes, a two-faced cam 360 (Fig. 8-A) is mounted on the control shaft 3| and arranged to engage a roller stud 36| on the end of an arm 362 at the same time that either the -pawl 3|3 or the pawl 3|'5 engages the stud SID. The cam 366 is shaped to act when the carriage is moved in either direction. The arm 362 is pivoted at 3613 on the machine frame and it has an abutment edge 364 engaging a stud 365 on a link 366. The lower end of link 366 has a lateral lug carrying a stud 361 positioned ov-er the edge of lever 336. As the link 366 is moved downwardly, the lever 330 will be ro-cked so that its lug 313| moves below the shoulder of the member 3|3. Accordingly, when said member 3|9 is moved forwardly to start the motor and engage the clutch, lever 336 will not be moved forward which means that the pawl 333 will not move forward to engage over stud 336. The result is that during the half rotation of shaft 82. the line space Ibail |64 will not be moved down in the manner heretofore described. However, said line space bail will be moved down slightly in order to enable the lever '353 to move to position to lock the platen frame against forward sliding movement. For this purpose the pawl 333 has an upper shoulder 368 positioned in lthe path of the reduced `portion of the stud 336, so that, when the pawl 333 `is moved downward, slide |56 will be moved down to rock the line space bail |64 sufficiently to release the lever 353 to enable its shoulder to `engage the stud 351 and prevent forward movement of the platen frame.

From this it will be clear that the mechanism may be automatically `conditioned by the carriage independently of a machine cycle to cause the motor to move the platen to throwback position with the front-feed throat opening at the same time or remaining closed.

Modified key control Figures -A and B-B also show a modied form of key control giving further selectivity in the manner in which the mechanism may be controlled at the option of the operator.

As in the prior construction, when the key 260 (Fig. 8-B) is depressed, it rocks the shaft 5B to start the motor and engage the clutch independently of a cycle of machine operation. This causes the platen to be moved to throwback position and, upon a second depression of the key, the clutch is engaged to cause the platen to be returned to printing position.

When the key 266 is depressed with the parts in the position shown in Figs. B-A and 8-B, the motor is started, the clutch engaged, and the platen moved to throwback position without Opening the throat. The throat is not opened because, at the time the parts operate, member 3|9 is latched in its rearward position and there is nothing to move the lever 326 forward to enable the pawl 333 to move over the stud 336. Consequently the line space bail |64 is rocked only 21 a short distance sufliclent to enable the latch 353 to prevent the platen frame from moving forward.

Provision is made, however, for enabling the key 200 to be used to cause the platen to be moved to throwback position with the front-feed throat open, and upon a second depression to cause the front-feed throat to be closed and the platen to be returned to printing position. For this purpose a manually movable member 3,16 (Fig. 8-B) is employed which is capable of being moved to two positions in both of which it is releasably held by a spring detent 31|. The upper end oi the member 319 has a lug 312 engaging an arm 313 xed on a shaft 314.. This shaft extends to the left-hand side of the machine (Fig. S-A) where it has a crank 315 xed to it, which crank is connected to the member 330. When the member 310 is moved to its rear position shown in Fig. l-B, the shaft 314 is rocked counterclockwise thereby pulling the member 339 forward and releasing the pawl' 333 for engagement over the stud 336. Then, when the key 200 is depressed to start the motor to move the platen to throwback position, the slide |56 will be moved to rock the line space bail |64 its full distance which will move stud into the path of abutment ||0 so that, when the platen moves back, the throat will be opened. Upon a second depression of the key the clutch will be engaged to cause the motor to close the throat and return the platen to printing position.

Thus the motor can be used independently of a machine cycle and at the option of the operator to throw the platen back either with the throat closed or with it open, and to return the platen to printing position and to close the throat ii said throat was open.

Modified paper guiding, Paper holding, and line finding assembly In the form of the invention first described the paper table and line finder are of the type disclosed in Patent No. 2,055,552 and separate paper holding devices are provided for holding the paper in position when the platen is moved to reading position. An improved construction has been devised that accomplishes all the results in one assembly.

Referring to Fig. 9, a support is provided comprising two arms 380 and 38| fixed to a shaft 33-2 journaled in the brackets 333 fastened to the raceway of the carriage. The support is thus pivoted in front of and it extends toward the platen. The shaft 392 and the arms 380 and 39| are urged counterclockwise in Fig. 9 by torsion springs 334, one end of each of which bears against its respective stationary bracket 333 and the other end against its respective stud 3&5 on. the respective arms 380 and 38|. The support is limited in its movement under the urge of springs 384 by the tail pieces 336 on the arms 390 and 38| which limit against the raceway o-f the carriage and hold the support in what may be called its normal position.

Mounted on the free ends of the arms 383 and 39| are parts that more properly comprise the line finder and the paper table, although the support above mentioned may also be considered as forming a part of the line nder or paper table, or both.

The line finder comprises a metal plate 39|! having its upper edge bent slightly and provided with markings as shown in Fig. 9. The ends of the plate are xed to members 3.9i which are fixed to a shaft 392. The shaft 392 is journaled in the ends of the arms 389 and 38 I. Each of the members 39| carries an upper roller 393 and a lower roller 394. adapted to be engaged by the. platen as will. be later explained, these rollers being illustrated. more clearly in their relation to the platen in Figs. ll-16, inclusive. The line inder may be swung about its pivot in the ends of the arms 390 and 38| from the line-finding position of Figs. 9 and 11 to the inactive position shown in Figs. 10 and 15, as will presently appear.

The parts that form what may be called a paper table or chute, or a paper guiding and holding means, are of simple and inexpensive construction and comprise two lingers 490. Each finger has spaced spring arms 40| integral with it. which arms are mounted on the shaft 392. These arms are formed so that they are not quite at right angles to the. body of the lingers but tend to diverge slightly. This formation causes them to releasably grip the shaft 392 so as' to hold the lingers 400 in the positions to which they may be adjusted and so as to cause them to turn with said shaft. If the operator wants to move one of the fingers laterally he presses the two arms 49| together slightly which frees the linger for easy lateral movement on the shaft. On releasing the arms they spring apart to again grip the shaft.

The lingers 45|) have lateral projection 402 on them which extend towardV one another. When the fingers 40|! are in horizontal position such as illustrated in Figs. 10 and 15, the projections 402 act to support a Work sheet as it is fed into the front-feed throat and thus act as a paper table. It is to be observed that the upper ends of the ngers are curved. This enables them to serve two purposes. First, it enables the fingers to llt about the platen when they occupy the position shown in Figs. 9 and 16, and thus they are able to hold the upper end of a work sheet against falling forward and in a position to enable the entries to be easily read. This is particularly valuable when the platen is thrown back to reading" position, although it is also uselhl when the platen is in throwback position with the throat open. The second function for the curved fingers is that, when they are in the horizontal position of Fig. 10, their outer ends extend upward and thus act as side guides. In other words, these simple, inexpensive paper ngers act as a. paper table, as side guides, and as devices for thlding the paper in position when the platen is own back.

While the line finder and paper table have been described separately, it will be apparent that the paper' fingers may be considered a part of the line find-er assembly and need not be designated as a paper table. Or the whole assembly maybe con sidered a sheet guiding, supporting, holding, and line fin-ding or collatlng means.

Means is provided which tends to move the line finder assembly either to a line finding and sheetholding position or to a sheet-receiving position. depending upon how said means is conditioned. In the embodiment of the invention illustrated this means comprises springs 403, the right hand one of which is shown in Fig. 9. The description will be confined to the right-hand spring. This spring is connected at one end to a stud 404 on the right-hand member 39| and at its other end to the arm 380 of the support. A similar spring is provided on the left-hand side of the assembly. 

